Adjustable duct header



FIG. 1 is a front perspective view of the adjustable duct header showing my new design.

FIG. 2 is a front elevation view of FIG. 1 .

FIG. 3 is a rear elevation view of FIGS. 1 and 2.

FIG. 4 is a left side elevation view of FIGS. 1 and 2.

FIG. 5 is a right side elevation view of FIGS. 1 and 2.

FIG. 6 is a top plan view of FIGS. 1 and 2; and,

FIG. 7 is a bottom plan view of FIGS. 1 and 2. 

The ornamental design for the adjustable duct header, as shown and described. 